Its an 8dB drop, the Dirac will boost broad based dips and needs overhead.

Its actually easy to ameliorate this:

1. Make sure that the volume in Dirac is turned to full.

2. Raise the WHOLE target curve upwards by dragging all the points upward, there will be much less attenuation.

There are handles at the 20 and 20k edges of the filter design, dragging them allows you to limit correction to any freq range.

Dirac user manual look at pages 19 and 20 check out the whole gain thing in the manual and page 29 for target curve design.

It is an exceptional program, I use the miniDSP version in my system.

Roon/Tidal, SBT, Trinnov ST2 , Twin Devialet D premiers, Vivid Audio Giya G1 Spirits, dedicated and treated room.
Meridian gear: 568.2mm and DSP5000's acting as TV speakers.